Printing machine



Oct. 13, 1925 E. GROSSE PRINTING MACHINE Filed May 5, 1921 llllllr/l/ll Y Patented Oct. 13, 1925.

EDUABD GROSSE, OF WACHWITZ, NEAR DRESDEN, GERMANY.

I PRINTING MACHINE.

Application filed May 5, 1921. Serial No. 467,187.

' (GRANTED UNDER. THE .I'ROVISIMN OF THE ACT OF MARCH 3, 1921, 41 STAT. I, 1,318.)

To all whom it may concern:

Be it known that I, EDUARD GRossE, a

' subject of Germany, and citizen of the Republic of Germany, residing at Wachwitz, near Dresden, Germany, Grundstr. 8, have invented certain new and useful Improvements in Printing Machines (for which I have filed applications in Germany, as follows: G 46353 XH/15d, filed March 6, 1918, Patent #376,781, and Germany, G 47444/ XII/15d, filed November 29, 1918, Patent #377,595), of which the following is a specification.

The present invention relates to a platen printing press of the known type, wherein the hard surface of the platen is directly brought onto the hard surface of the setting plate in order to perform the printing action which, as may be easily understood cannot be done without a very high pressure so that a very strongly built machine must be used and even then the production of large sheets in producing auto-types is difiicult and consists in the combination, construction and arrangement of parts herein described, having the purpose of reducing the necessary pressure.

With these and other objects in View, the invention consists in a device which may or may not be used in respective circumstances according to which the pressure of the platen will not act directly upon-the hard surface of the setting plate, but effects a primary print which by means of a roller is transmitted upon an elastic flat form, onto which the platen carrying the working sheet is pressed. The operation with this elastic form requires but very little pressure even in the production of large sheets and allows the printing machine to be lightly built, and moreover said arrangement permits the printing of two colored prints in onestroke.

The accompanying drawings represent some different forms of the present inven-' tion and the way of applying the same in different printing machines.

Fig. 1 is a section through-the first form of execution of the present invention,

Fig. 2 is a detail view,

Fig. 3 is a diagrammatic view of a toggle-joint-lever press with the rotating roller system according to Fig. 1.

As may be seen from the drawings, Fig. 1 shows the present invention as adapted to a platen press in which the paint-applying and transmitting rollers are arranged to be rotated round the middle-portion of the press, so that a quiet and'even movement-is obtained.

The numeral 1 indicates the casing of the platen press, 2 and 3 are disks which are arranged inthe middle-portion of the press, and 4 is an endlessmetal band, running over said disks 2 and 3. The paint-applying rollers 5, 5 and the transmission roller 6 are arranged on said metal band and adapted to rotate therewith round the middle-portion of the press. The said endless band 4 is driven by the spur gears 7 and 8, the latter of which is mounted upon the main shaft 9 of the printing press. Said main shaft carries the crank 10 adapted to transmit a toand-fro movement from shaft 9 to the platen 11. It is understood that during each toand-fro movement of the platen the spur gear 8 will complete one rotation. As the spur gear 8 engages the spur gear 7, which is half as large as the gear 8 and mounted on the same shaft 12 as the disk 2 which carries the metal band 4, the spur gear 7 and the disks 2 will complete two rotations during each rotation of the spur gear 8 and each to-and-fro movement of the platen 11, so

that the endless metal band 4;, which is twice as long as the periphery of the disk 2, will be guided once round the middle portion of the press during one to-and-fro' movement of the. platen. This is due to the difierence in size of the spur gears 7 and 8.- As the paintapplying-rollers and the transmission roller are fixed on said metal bandthe same will also be carried once round the middle-portion of the press during one to-and-fro movement of the platen 11.

13 is the setting plate and 14 the flat form. 15 is the paint-roller which is adapted to rotate in an opposite sense to the paint-applying-rollers, in order to enable the latter to take up ample and well distributed paint, which they may carry over to the printing forms. 16 are teeth provided at the periphery of the transmission roller and adapted to engage a rack 17 arrangedround the middle portion of the printing press.

18, 18 are movable roller-carriers, in which the rollers 5, 5 for applying the paint and v the transmission roller 6 are rotatably mounted. Said roller-carriers are guided tion at the from the wheel 8 and the distributing rollers 24, 25, 26 and 27, which are supplied with paint by roller 28 from the roller 29 of the paint-reservoir.

The abovedescribed machine operates asfollows 2- The settin plate 13 is shown in its posiack of the machine, the fiat form 14 being arranged on the same side with the platen 11, the press being represented in its printin' position.

The platen 11 1s adapted to press against the flat form 14 and the paint-applyingrollers 5, 5 are run over the and take up paint.

If in continuation of the mpvement, the

laten 11 passes from its printing position into the position for receiving the working sheets, the endless metal band 4 moves on with its rollers 5, 5 and 6 in the directionof the arrow, so that the rollers 5, 5 are run over the setting form 13 andprovide the same with paint.

Thereafter the rollers are guided round the lower part of the platen printing press and pass forward over the form whlle the platen is in open or retracted position. Said paint-applying-rollers may be somewhat raised by any touching the flat form. The transmissionroller 6 however which is rotated by the rack 17 moves over the flat form 14 and transmits thereto the picture, which it has received from the setting plate 13 in passing the same.

Thereafter the rollers are moved around thedisks 30 and over the paint-roller 15, while the platen 11 moves to printing position so that the print upon the flat form 14 will be printed on the working sheet upon the platen 11.

It will be understood that the printing acpaint-roller 15 tion will be performed a follows The transmission roller 6 takes up the negative picture from the setting form 13 having been previously provided with paint. On the roller 6 the picture is a positive one. Said roller transmits this positive picture to the elastic flat form 14, as hereinbefore stated, and hence forms a negative picture thereon, which produces a positive picture upon the working sheet lying upon the platen11. The transmission roller being rotated by the rack 17 in order to obtain a means in order to prevent paint-applying-rollers sharp im rint, may besides be provided with little rol ers adapted to be guided in respective guides, which may be raised or lowered in res ect of the length of the forms 13 and 14. T e spring-controlled ing-rollers 5, 5 are as well guided in adjustable uides by mean of respective rollers It is evident that two or more sets of paint-appl ing-rollers as well as two transmission ro lers may be provided. This may be done in applying the second set of rollers at the opposite side of the metal band 4. In this event there must be a toothed wheel and a gear which in each rotation of the spur gear 8 efiects but one rotation of the disk 31. As the metal band 4 is twice as long as the periphery of the disk 31 the rollvers 5, 5 and 6 will in this form of execution complete but one half rotation during one to-and-fro'movement, so that the oppositely arranged rollers will be alternately caused to pass'between the platen 11 and the flat around the middle-portion of the printing press, disks in the upper and lower part of said middle-portion of the printing press for guiding said band, means for rotatin said disks with said carrying means an means for moving said platen, each driving means cooperating with the other in such a manner asto accommodate the rotation of the carrying means around the middle-portion of the printing press, to the to-and-fromovement of the platen, substantially as described.

2. In improvements in platen-printing machines, a platen, a setting plate and an elastic flat form arranged around the middle portion of the printing press, paint-rollers, paint-applying-rollers and a transmission roller and an endless band carrying said and transmission roller, a rack provided around the middleportion of the printing press, teeth provided at the periphery of said transmission roller being adapted to engage said rack in order to obtain an exact print on said transmission substantially as described.

paint-applyv form 14, and a quick movement of the platen v In testimony whereof I aflix my signature.

EDUAR D GROSSE. 

